Impulse transmitter



May 12, 1942.

WOLF IMPULSE TRANSMITTER Filed Dec. 6, 1957 www INVENTOR. F R/ 7 Z W OLF ATTORNEY.

Patented May 12, 1942 IMPULSE TRANSMITTER Fritz Wolf, Birkenwerder, near Berlin, Germany,

assignor to. Siemens & Hals'ke Aktiengesellschaft, Wernerwerk, Siemensstadtynaar Ber-U lin, Germany Application December 6, 1937, Serial Ndflraess In Germany December 12, 1936 2 Claims.

The present invention relates to. a Reg stering device and in particular to a register sender for telephone systems. a

The purpose of the invention is to register switching critera, for example digits to be transmitted, and subsequently to transmit them,v this being realized in that .the switching criterion is taken up by a condenser, the number of switch! ing operations required being determined by .the application of potential up to a. definite limiting value. i- He A further. characteristic oi the invention resides in that .the striking potential of .a glow lamp serves to mark the limiting potential An embodiment of the invention is represented in the drawing. The invention is not limited to this embodiment. Only.those details which are necessary for the comprehension of the invention have been shown.

The embodiment represents a sender switch which is provided with. a condenser 0 each digit, the condensers being charged to all f ential. by depressing a. digitkey, the potential corresponding tothe key depressed. .I f, ior example, the. key 6 is depressed the potential only becomes sufficientlyhigh for the glow lamp to strikeafter six .impulsea. (For graduallyincreasing the charging potential a rotary switch is used according to the invention, Naturally relays could alternatively be used for this pur-.

pose.) V I The rotary. swtch with the'rotary magnet Dd serves to connect up the individual condensers Kl to K6, while. the rotary. switch having. the rotary magnet D2 servesto connect the. additional potential in. stages. The additional potential is. supplied from an auxiliary. condenser Kh. The glow lamp is indicated by the ref-. erence Gi. 1

For controlling the. metering switch a single row of keys is provided- The. individual keys are transitorily depressed in succession by the party operating the device. During the transitory depression of the keys the corresponding condenser is charged with a definite potential so that the potential corresponds to the particular key depressed. a

V The arrangement operates therefore in the followingwayz g Each time one of the keysTl to Till i depressed the key X is also depressed automatically. Through the closing of this key the following circuit for relay T. is completed: earth, battery, the winding of relay T, contacts Illa, lls, key X, earth. In this circuit relay 1 ener gizes. Through the closing ofcontacts [2t and i325 current is applied to the resistance W! to Wlll.v If new theffirst key to be depressed is the. key t e conde ser K which cor spo ds to the first. level is. charged inthe following Q11! cuit: earth, battery, contact |2 t, key.Tl; lead l3, c nta t. v lmwip r d of he. r ary s i ch Dl' i pos ion 0. c n e K on a t to. ear h-v Throu t e closing of con ao Jfi a c rcui -is completedfor the upper windingofrrelay A; The following circuit for the rotary magnet Di of the r ta y sw tch. s omp eted through t ey c s n of contacts Ila and I8t: earth, battery, rotary magnetDl, contactsfla, lat, earth. The switch DI consequent y ta es a s ep f wa d so tha i s wip r ldl has nOw passe rom on a t 0' tocontact I. Through the opening of contact. Illa and the closing of contact. Illa, relay Tis dis -1 connected. Relay ..T..releases and by opening contact i812 the.,circuit' for DI is openedv again. Relay A holds up although. contact [6 ha opened so o g a t k y re ain d r sse Th lock n c u r ela s as follo s: ear h. battery, the upper winding of relay A,,.key An'I', key A'IY, e urp o the e k ys will b described later), contacts i911, lls, key X,v earth. Since thekey X is Stilldepressed during .the

step taken by the switch the potential destined for condenser Kl must be prevented fromoper ating on the condenser K2. This is provided for in that contact Na. in the lead I3 is open during. the step. The switchv DI nowstands therefore with its wiper ldl on the first contact of its contact. bank and thus connects up the condenser K2 which is providedfor the second level. If now a key T6 is depressed condenser K2 is charged to a correspondingpotential. While on the depression of the key .Tl charge took place at a potential of, for example, -60. volts, after the depression of the key T6 a potential of -30 volts is applied to the condenser K2. The potential applied by the different keys varies from key to key by 6.

' volts. .At the same time as key T6 is depressed the key)! will close again so that the operations already described are repeated, i. e., the switch Di takes a further step under the action of contact. lla, and Hit so thatnow wiper ldl stands on contact .2 of the contact bank and I is connectedby condenser K3. This condenser is now similarly charged by the depression of any other key the s ngle keyset provided. These operations are continuedv as. manytimes as there are digits in the subscriber's number to be transmitted. It will be assumed that 6 energizing of relay ually charged condensers Kl to K6 now has its wiper 2dl on contact 6 in the contact bank. The following circuit for relay S is now closed:

earth, battery, winding of relay S, contact 30a,-

contact 6 in the bank of wiper 2dl, key AT and earth. In this circuit relay S energizes and closes its contact 318 and thus locks up. Through the opening of contact 323 and the closing of contact 33s the following circuit is completed for relay J; earth, battery, the upper winding of relay J, lead 36, contact 338 and earth. vRelayJ energizes in this circuit. Through the closingof contact 317 the rotary magnet D2 of the .switch D2 is subjected'to current. Wiper M2 takes a step forward and passes to position. I in its contact bank. Since now relay T has released the functions of contacts I 2t and it are taken over by contacts 40s and Ms. The auxiliary condenser Kh is charged in the following circuit: earth, battery, "resistance WI-Wilead .42, wiper M2, the. contact 43a, auxiliary condenser Kh, contact Mu and .earth. The auxiliary condenser Kh is. charged at 6 volts in this circuit in 'dependenceupon resistance WIILI n the energizing of relay J moreover contact 50:1 was closed and thus a circuit wascompleted for relay 0. Relay 0 closes. its contact 0 and thus completes a circuit for the lower winding of relay A. Relay A closes its contact 5211 in the circuit for relay U.. Since relay A closes its contact 53a the upper winding'of relay J is short-circuited and this relay makes the delayed release. Since contact 52a is closed the closing of contact 547' completes a circuit for relay U. The circuits described pass to earth over contact 33s; relayU opens its contact I 5a and closes. its contact 551;. Moreover contact 43a is opened and contact 56ucloses. Finally contact Mu is opened and contact 5'Iu closes. Since through the closing of .con-, tacts 56u and 511; both condensers, in this case KI and the auxiliary condenser Kh, are connected in series, the potential is sufficient to cause the discharge tube G1 to strike. According to the embodiment the striking potential of the. discharge tube G2 is 126 volts. Through the connection in series of the condenser KI which'in .this'case has been charged to a potential of 60 volts through the depression of the key TI and the auxiliary condenser Kh which has a potential of 6 volts and including the potential of the battery at the discharge tube of 60 volts the potential of 126 volts is reached. The discharge circuit is over contact 5511. and wiper I dl in position-6 to earth. In this case therefore the striking potential of the discharge tubeis reached after one step .of the switch D2 and relay P energizes over its upper winding in series with the glow lamp and thus terminates the transmission of impulses by opening contact Gllpin the sending circuit. Since the key -TI was depressed .only one impulse had to be transmittedover the lead 6|. Through the O the contact 620 was closed once.

Instead of the discharge tube a different device can be provided having the efiect of causing the relay P controlling the impulse transmission to energize at a given potential. For example, a so-called lightning arrestor can be provided also the arrangement can be made to operate so that relay P did not energize but release.

Through the energizing of relay P contact 63p is also closed; thereby the lower winding of relay P is connected in the following circuit:

, earth, battery, lower winding of relay P, contact 63p, wiper 3012, of the switch D2 and earth. In this circuit relay P holds up. Relay S is consequently made independent of contact 30a. If, ,for example, switch DI has reached position 6 and the key depressed has not yet been released relay S would energize and the transmission of impulse trains would commence. In order to prevent this it is made necessary for relay A to release and to close contact 30a after the release-of the key last depressed before relay S energizes. Since contact 30a opens and closes continuously on the impulsing it. is shunted by contact 3ls of relay S. e i

The relay group, J, 0 and Aoperates meanwhile in the manner described so that the switch D2 is brought to the rest position over contact 317'. Thehoming period of the switch D2 provides sufiicient time between the impulse trains transmitted for the necessary switching operations to take place at the switches to be set by the impulsing trains. Since wiper 4112 in the zero position o'f switch D2 is connected to earth the condenser Kh in the event of its having a residual .potential, is discharged in order .to be ready'in a discharged state for the next charging operation. When the switch D2 executes the last step its wiper ld2 earths the last rotary contact and thus closes a circuit for the rotary magnet DI, since contact Ills is closed, so that the associated switches make one step and pass into position 1.. In spite of wiper.v Zdl being now in position I relay Sremains energized- Wiper 3122 of switch D2 has passed away from its continuous contact bank and has returned tothe rest position consequently relayP is deenergized andcontact 60p in the impulsing circuit has again closed. Meanwhile the relay group J, O, A has operated again. The closing of contact 620 which lies in the impulsing circuit cannot be effective however so long as contact 60p is open. Since now contact 601) is closed the impulses proceeding from this relay group are again operative The switch D2 is advanced. The second digit to be transmitted is the digit 6 i. e. the key T6 has been depressed. Thecondenser K2 was thus charged at 30- volts. In order now to reach the striking potential of the discharge tube G i (126 volts) it is necessary to apply 6 volts sixtimes to the auxiliary condenser Kh. Relay U has operated at each step of the switch D2 and has operated its contacts as above described. It is thus determined on the individual steps whether the potential produced by the connection in series of the condenser K2 and Kh is suflicient to strike the discharge tube. This striking potential is, however, only reached when the wiper 4d2 has reached position 6 in its contact bank. Meanwhile impulses are transmitted over contact 620 until in position 6 of the switch D2 relay P energizes as already explained and locks up and at .contact 60p disconnects the impulse circuit to terminate the impulse transmission. The switch D2 then restores to its original position thereby providing the time necessary between the transmission of impulse trains and whereby relay P again releases for the purpose of influencing the next impulse train to be transmitted.

The other digits are transmitted in the same way. The case will now be described in which the last digit is the digit 10. In this case the condenser K6 is charged in dependence upon the key TIU which has been depressed, to a potential of 6 volts. In this case the switch D2 must execute steps in order to impartan additional potential of 10 times 6 volts-60 to the auxiliary condenser Kh so that again the striking potential of 126 volts is connected to the discharge tube whereupon ten impulses are transmitted.

The arrangement thus operates so that an additional six volts is connected up on each successive step and that during each step one impulse is transmitted. It could also be arranged that through this successive application of auxiliary potential a particular position of the switch D2 is reached and from this position a corresponding number of impulses could thus be transmitted i. e. so that the transmission of impulses should remain dependent upon the successive application of additional potential but would not take place simultaneously with the application of potential.

Furthermore the system could be so arranged that a plurality of condensers and auxiliary condensers are provided which when charging are connected in parallel and when discharging are connected in series whereby higher potential stages could be used. The arrangement could, of course, also be reversed so that on charging the condensers are connected in series and on discharging in parallel.

For the case in which the impulses to be transmitted do not have the same number of digits as frequently occurs in telephone systems it is arranged that the digits registered can be transmitted after less than six digits have been so registered. Assuming that in the present case only one digit, for example the digit 1, is to be transmitted the rotary switch Dl must be brought into the sending position after, the reception of one digit. This is able to be effected by the depression of the key AnT. Through the depression of this key relay T energizes and together with relay A, the two relays acting as an interrupter, brings the rotary switch to position 6 in which relay S energizes and disconnects relays A and T at contact lls. In position 6 the same operations occur as already described when the switch D2 was brought to position 6. In the present case the switch D2 is restored to normal by depressing the key AT. Relay S releases and the homing circuit for D2 is closed over contact 32s. Moreover over key AT when depressed the following circuit for relay T is completed: earth, battery, relay T, contacts Illa and Us, key AT,

wiper 5d! of switch DI and earth. In this circuit relay T energizes and since the key AT is opened in the circuit for A operates it together with the relay A as an automatic interrupter until the wiper 5dl of the switch DI has passed away from its continuous contact bank.

For the case in which for any reason, for example through being knocked, the switch D2 is moved 01f normal a homing circuit is set up over the lower winding of relay J which passes over wiper 2d2, contact 32s and a contact 8M2 of the switch D2.

In order to bring the switch DI to rest in such a case the key AT has to be depressed.

What is claimed is:

1. In combination, two condensers, means for placing a variable charge upon one ofthe condensers, a charging circuit for the other condenser, a discharge path for said two condensers, means for connecting the other condenser alternately to said charging circuit, and to said discharge path, said last means effective to disconnect said other condenser from said charging circuit whenever it is connected to said discharge path and to disconnect said other condenser from said discharge path whenever it is connected to said charging circuit, means in said charging circuit for increasing the charge upon said other condenser by a predetermined increment each time same is connected to said charging circuit, thereby to raise the potential of said other condenser in substantially uniform steps, and a device in said discharge circuit operated when the charge upon said other condenser reaches an amount dependent upon the charge upon said one condenser.

2. In a register in which a digit is recorded as a quantity of charge on a register condenser, means for determining the value of the recorded digit comprising, a testing condenser, a charging circuit for said testing condenser, means for connecting said testing condenser alternately in said charging circuit and in series with said register condenser, means for altering the potential-of said charging circuit between successive connections of said testing condenser therein, said last means operated repeatedly in synchronism with said connecting means and effective to change the potential of said charging circuit progressively in substantially uniform increments, whereby the successive connections of said testing condenser in said charging circuit vary the potential of said testing condenser in substantially uniform steps, the number of steps required to cause the effective total potential of said two condensers to arrive at a predetermined value being a measure of the charge on said register condenser and hence characteristic of the digit recorded,

' FRITZ WOLF. 

